Re: Trying to.... It's amazing and it works!

[Manu Valderrama]

Ouch!! I'm somewhat confused with all this things! My main problem is 
with the
msgh_bits field in the header of the message; fortunately, you have give 
me some insight.

> Well, first, that is not a macro. But you use it only if you want to make a send
> right, that's right. Remember what I've said. Using MACH_MSG_TYPE_MAKE_SEND is 
> really
> like doing a mach_port_insert_right to create a send right, except that it does 
> that
> during the message transfer: you supply it a _receive_ right (the one you 
> created with
> mach_port_allocate), and it creates a send right during the message is 
> transfered. Here,
> you should actually do like I said in the paragraph I just quoted: use 
> MACH_MSG_TYPE_MAKE_SEND
> to create a send right, and receive it (as you receive your int), so you can 
> use it later for
> answering. 
>  
Taking into account your advice, my final code is something like that ;

err = mach_port_allocate( mach_task_self(), MACH_PORT_RIGHT_RECEIVE, 
&receive_port );

and filled the msgh_bits field with :

my_message.head.msgh_bits = MACH_MSG_TYPE_MAKE_SEND;

this appears to have some sense; like what you explain above... it also 
worked in the
expected way. Anycase, I think that some time for repose the ideas and a 
bit
more reading of "kernel principles" is the best I can do now for mach 
learning.
( I also have read the Mach chapter in Tanenbaum's book "Modern Operating
System", first edition, I think ).

Thans for the help!!